>I tried lots of different ideas without luck. So, finally I ended with inserting one additional record, if group ends on odd page. This report uses Situs order, which is ccode+city+... At the enter of the group I call a function. This function checks, if it's an odd page, and if it is, it inserts ccode, alltrim(city)+'ZZZ', street='zzzzzzzzzz'. I use few other tricks here.
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Yes, I've used tricks like that on occassion too.

>Anyway, finally it produces a blank page, where it should be inserted. The only problem here, that the report should be printed twice (first time it could be print to dummy file). Also there could be potential multi-user problems, but this is very unlikely.
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Printing twice isn't a problem. You can either call the report twice in code or change the Copies= line in the EXPR field. But I don't understand why you would have a multi-user problem. You're building a cursor to print the output, right? That shouldn't create any multi-user problems.